k190gb.m77t and k190gb.h77t: MGD77T data and header files for single-beam bathymetry data for field activity K-1-90-GB in Glacier Bay, Alaska from 06/14/1990 to 06/24/1990

Single-beam bathymetry data along with SINS navigation data was collected as part of the U.S. Geological Survey cruise K-1-90-GB. The cruise was conducted in Glacier Bay, Alaska from June 14 to June 24, 1990. The chief scientist was Paul Carlson from the USGS Coastal and Marine Geology office in Menlo Park, CA.
The overall purpose of this study was to look at glacial discharge streams and morainal banks of tidewater glaciers and imaging of gulleys and chutes on a pro-delta face in Queen Inlet and ice gouges on the moraine at the mouth of Muir Inlet.The geophysical source was a 7 kilohertz (kHz) and 3.5 kHz system.
These data are reformatted from space-delimited ASCII text files located in the Coastal and Marine Geology Program (CMGP) InfoBank field activity catalog at http://walrus.wr.usgs.gov/infobank/k/k190gb/html/k-1-90-gb.meta.html into MGD77T format provided by the NOAA's National Geophysical Data Center(NGDC). The MGD77T format includes a header (documentation) file (.h77t) and a data file (.m77t). More information regarding this format can be found in the publication listed in the Cross_reference section of this metadata file.

单波束测深数据与捷联式惯性导航系统（Strapdown Inertial Navigation System, SINS）导航数据，系美国地质调查局（U.S. Geological Survey, USGS）科考航次K-1-90-GB的采集成果。该航次于1990年6月14日至24日在阿拉斯加州冰川湾开展作业，本次航次的首席科学家为来自加利福尼亚州门洛帕克市美国地质调查局海岸与海洋地质办公室的保罗·卡尔森（Paul Carlson）。

本研究的核心目标为分析潮汐冰川的冰川径流与冰碛岸带，对女王水道（Queen Inlet）前三角洲坡面的冲沟与槽道开展成像观测，并探究缪尔水道（Muir Inlet）口冰碛上的冰蚀痕。本次探测所用的地球物理震源为7千赫（kHz）与3.5千赫系统。

本数据集源自存储于美国地质调查局海岸与海洋地质计划（Coastal and Marine Geology Program, CMGP）信息库野外活动目录（http://walrus.wr.usgs.gov/infobank/k/k190gb/html/k-1-90-gb.meta.html）中的空格分隔ASCII文本文件，现已转换为美国国家海洋和大气管理局（National Oceanic and Atmospheric Administration, NOAA）下属国家地球物理数据中心（National Geophysical Data Center, NGDC）提供的MGD77T格式。MGD77T格式包含头文件（文档文件，后缀为.h77t）与数据文件（后缀为.m77t）。有关该格式的详细信息，可参阅本元数据文件交叉引用部分所列的相关出版物。